Insulator bracket



Aug. 29, 1961 w. L. HOLLANDER INSULATOR BRACKET Filed Oct. 21, 19582,998,477 INSULATOR BRACKET William L. Hollander, Centralia, Mo.,assignor to A. B. Chance Company, Centralia, Mo., a corporation ofMissouri Filed Oct. 21, 1958, Ser. No. 768,708 2 Claims. (Cl. 174-163)This invention relates to insulator brackets, and with regard to certainmore specific features, to safety brackets of this class adapted forconvenient application to and removal from transformers, being animprovement upon that disclosed in the United States patent applicationof Charles Holland Nix, Serial No. 768,707, filed October 21, 1958, forInsulator Bracket.

Among the several objects of the invention may be noted the provision ofan improved, more compact form of transformer insulator bracket forsupporting secondary risers therefor, in which the number of partsrequired and the cost thereof are reduced; and the provision of aninsulator bracket of this class which may be more convenientlyinstalled. Other objects and features will be in part apparent and inpart pointed out hereinafter.

The invention accordingly comprises the elements and combinations ofelements, features of construction, and arrangements of parts which willbe exemplified in the structures hereinafter described, and the scope ofwhich will be indicated in the following claims.

In the accompanying drawings, in which one of various possibleembodiments of the invention is illustrated,

FIG. 1 is a side elevation of a transformer bank showing the inventionapplied thereto;

FIG. 2 is a perspective view of my new insulator bracket in an openposition; and,

FIG. 3 is a fragmentary detailed section showing a clamped position ofbracket parts on the roll-seamed bottom rim of a transformer.

Corresponding reference characters indicate corresponding partsthroughout the several views of the drawings.

Referring now more particularly to FIG. 1, there is shown at numeral 1 apole having brackets 3 for transformers 5 and 7 having lower rims 8. Thetop closures of the transformers are indicated at 9. The primary wiresof such transformers enter the tops 9 through suitable insulatorbushings (not shown). Ground wire connections are shown at 11. So-calledsecondary riser wires are shown at 13. These usually enter thetransformer at upwardly located bushings, such as shown at 15. Therisers are supported at their lower portions upon a bracket 17.

Secondary risers such as 13 should not be allowed to hang free to becomesubjected to conditions of wind, weather and vibration. If so, it is notuncommon for them to be forced against the transformer casings, shown at19. The result is a wearing away of the wire insulation andshort-circuiting.

In said application is disclosed broadly a transformer insulator bracketfor avoiding the above-mentioned dangers. In order to reduce the cost ofthe transformer bracket while making it stronger, and in order to makeits application more convenient, I provide the structure shown in thepresent drawings. This consists of a metal loop 23 having a bottom wall25, a first straight transverse finger member 27 at one end and a secondcurved finger member 29 at its'other end, turned in as at 31 toward thefinger member 27. Finger member 27 is drilled and tapped at the level ofthe turned-in portion 31, for the reception of a threaded bolt 33. Thepurpose of this is that the inner face 35 of the turned-in portion 31shall form one jaw of a clamp and the inner face 37 of the threadedshank 33 shall form an opposite jaw thereof.

nited States Patent Patented Aug. 29, 1961 The loop 23 is preferablyformed by bending from a fiat stock of deformable steel.

The bolt 33 is provided with a wrench-engaging head 38. Its shank isadapted to pass through the central opening of a hollow spool-shapedinsulator 39. At 41 and 43 are shown lock nuts. Between the head 37 andinsulator 39 are provided a metal washer 4S and a resilient washer 47.Likewise, between the lock nut 41 and the insulator are provided a metalWasher 49 and a resilient washer 51. The lock nut 41 is threaded intoposition to clamp the insulator and washers against the head 37. Thelock nut 43 is then applied before bolt 33 is threaded into the hole infinger 27. Thereafter lock nut s3 is located between said finger 27 andlock nut 41.

For use, the bracket is assembled as shown in FIG. 2, wherein theinsulator 39, washers 45, 47, 49 and 51 have been stacked and the bolt33 passed therethrough, the lock nut 41 drawn up. The lock nut 43 is inloose position and shank 33 is partially threaded into the finger 27.

In order to apply the bracket, it is only necessary to back off the bolt33. This is accomplished by hand-turning the insulator 39 until the gap53 between the jaw portions 35 and 37 is opened suificiently to receivethe usual rolled seam 21 between the insulator casing 19 and its bottom55. Then the bracket, after partial closure by screwing in the shank 33,may be moved around the insulator bottom until it is in the correctposition with regard to whatever secondary riser is to be anchored. Thenthe bolt 33 may be quickly screwed in by hand action on the insulator 39and finally clamped tight with the aid of a wrench on the bolt head 33.Then the lock nut 43 is turned down against the finger 27. Finally theriser wire is laid in the convex portion 57 of the insulator spool 39and wired on by a short length fastener wire such as shown at 59.

The present bracket, which is quick-attachable, may be made stronger andmore compact at considerably less cost than the one described in saidapplication and, moreover, it may be much more conveniently applied,since it is not required to carry out any turning manipulations underthe transformer. Thus it is apparent that the bare-hand and wrenchmanipulations may be carried out from outside positions relative to thelower ends of the transformers.

It should be noted that in some cases transformer bulged rim seams suchas 21 may be rolled inward with respect to rim 8 of the casing 19,instead of outward, as shown in FIG. 3. The inward extension 31 is toprovide space 2 for such conditions (see FIG. 3).

In view of the above it will be seen that the several objects of theinvention are achieved and other advantageous results attained.

As various changes could be made in the above constructions withoutdeparting from the scope of the invention, it is intended that allmatter contained in the above description or shown in the accompanyingdrawings shall be interpreted as illustrative and not in a limit ingsense.

I claim:

1. A quick-attachable insulator bracket for a suspend ed transformerhaving a downwardly extending rim terminating in a bulged seam;comprising a bottom wall adapted for placement under said rim and seam,first and second finger members extending up from said wall forplacement outside and inside respectively of said rim when the bottomwall is under it, the first finger member extending a greater distancefrom said wall than the second finger member, said second finger memberbeing turned toward the first finger member, an insulator spool havingan axial hole therethrough and adapted to sup port a wire, a bolt memberpassing through said hole and threaded through the first finger memberin line with the turned-in portion of the second finger member, wherebya clamp is formed of the fingers, wall and bolt, said clamp being in theform of a loop adapted to accommodate said seam therein upon clampingengagement with said rim above said seam of the turned-in portion of thesecond finger member inside of the rim and of the bolt outside of therim.

2. A quick-attachable insulator bracket according to claim 1, whereinsaid bottom wall and fingers are formed by integral bent portions of acontinuous length of deformable metal, including a lock nut threaded onthe bolt between the insulator and said first finger member adapted tobe threaded into engagement with said first finger member, and includingon the bolt a head and an additional threaded lock nut adapted to clampsaid insulator rigidly thereon.

References Cited in the file of this patent UNITED STATES PATENTS1,580,302 Johnston Apr. 13, 1926 2,264,493 Werning Dec. 2, 19412,437,344 Behlmann Mar. 9, 1948 2,456,547 Weber Dec, 14, 1948

